Max Input Voltage to STC-7

Discussion in 'STC Series CMOS' started by Tim Povlick, Nov 10, 2020.

  1. Tim Povlick

    Tim Povlick Cyanogen Customer

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    The manual and the forums but can't see a spec for the maximum input DC voltage.
    The manual states 12V-DC but no spec on max or min for that matter.

    _..--
    Tim
     
  2. Colin Haig

    Colin Haig Staff Member

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    Hi Tim, that's based on the power supply voltage for the included AC adapter.
    What were you thinking of running it off of?
    e.g. 13.8V system? Lead acid battery that drops down to 11.5V?
    I can check with our engineering on this.
     
  3. Tim Povlick

    Tim Povlick Cyanogen Customer

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    Hi Colin,

    I tend to run things a bit 'hot' and was looking at 14.5 but will reduce it to 14.0.
    14.0 what do you think?

    Tim
    [​IMG]
     
  4. Doug

    Doug Staff Member

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    I recommend that you do not exceed 14V.
     
  5. Colin Haig

    Colin Haig Staff Member

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    Tim, I'd run thicker gauge wire and lower voltage. There is no advantage to the camera getting more voltage. Also many mounts and dew controllers are limited to <14V.
     
  6. Tim Povlick

    Tim Povlick Cyanogen Customer

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    I'll run some 4/0 in 3" rigid conduit. :)

    The wiring is #12 landscape low voltage (LV) wire, two pairs with one them dedicated to the camera. I reset the voltage to 13.00-V. With the camera at idle (0.74-A) the voltage drop is 0.07-V (estimate 6 meters of wire) #12 LV has a drop of 0.0933-V per Amp for 6 meters. The STC-7 worked flawless for several hours in 0-C temps.

    Tim
     
  7. Colin Haig

    Colin Haig Staff Member

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    For anybody else reading this, we'd prefer you stick with the factory-supplied power supply.
     
  8. Lawrence D. Lopez

    Lawrence D. Lopez Cyanogen Customer

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    Hi Colin:

    Would it be possible to contact engineering and request that the correct power requirement and power connector be added to the specifications in the user manual.
    Most quality astronomy equipment runs off of 12 volts and can be plugged into a cigarette lighter of a car.
    Switching power supplies are used internally to the devices and they have a very wide range of input voltages.
    I've run my ST402, STL 11000 STL 6303 and FLI 6303 all off of the same 12 volt power supply for years.

    Thank you,
    Lawrence D. Lopez
    New Boston, NH
     
  9. Colin Haig

    Colin Haig Staff Member

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    Hi Lawrence, the next update to the manual will include this information:
    STC_power.png

    All ALUMA CCD and STC CMOS, and SC (CMOS) guiders use the Kycon 806-KMDLAX-6P - a robust, latching connector very similar to a 6-pin Mini-DIN.
    Pinouts as shown in the attached diagram, found in the STC-428 manual.
    Power recommendation is +12V. I've been advised it should not to exceed 14.0V.
    Note that if you are making your own power cable, do not connect the metal shield to the GND (0V) pins.
     
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  10. Doug

    Doug Staff Member

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    The connector specifications and recommended mating connector are already in the manual.

    I will add a note about the recommended maximum input voltage.
     
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